CN106325022B - Developing box - Google Patents

Abstract

The invention discloses a developing box, comprising: a case body; a developing roller; a developing roller gear; a drive assembly; the drive assembly includes: a power receiving part; a gear member with which a developing roller gear is engaged; and the control part is provided with a power transmission part, the gear part is provided with a meshing part, when the power receiving part stretches out, the power transmission part is meshed with the meshing part, when the power receiving part retracts, the power transmission part is disengaged from the meshing part, and the small-diameter part plays a role of a clutch, so that the power receiving head and the machine driving head can relatively rotate, the meshing state is released, the developing box cannot interfere with the image forming device, and the developing box can be smoothly taken out from the image forming device.

Description

A developing box

Technical field

The present invention relates to a developing cartridge, and in particular to a driving assembly of the developing cartridge.

Background technique

Imaging equipment, also known as electrophotographic imaging equipment and image forming devices, is a device that forms images on recording materials through the principle of electrophotographic imaging. For example, electrophotographic copiers, laser printers, electrophotographic printers (such as laser printers and LED printers, etc.), fax machines and word processors, etc. The image forming apparatus generally includes a developing cartridge detachably provided on the main body of the image forming apparatus.

Generally, a developing roller is provided on the developing cartridge, and the developing roller is provided with a driving assembly. The driving assembly engages with the machine drive head in the image forming device to drive the developing roller to rotate and drive the entire developing cartridge to work.

Chinese Patent Publication No. CN102419531A discloses a developing cartridge that is installed in an image forming device with a disc-shaped mounting position. The disc-shaped mounting position of the image forming device is divided into four independent spaces, each with For installing four color developing cartridges, the image forming device has a photosensitive drum. When working, the installation disk drives each developing cartridge to rotate relative to the photosensitive drum, thereby developing the electrostatic latent image on the photosensitive drum. It is located in an axial direction of the developing roller. The drive assembly at the end adopts a ball-type universal joint meshing structure. This kind of meshing structure is easy to come out of the drive assembly, especially during transportation. This phenomenon is more likely to occur. In addition, the universal joint meshing structure is more difficult to mesh with the machine drive head, causing the drive assembly to lose its function or work incorrectly. Stablize.

Chinese Patent Publication No. CN204188951U discloses a developing box. The driving component of the developing box is configured to be able to control expansion and contraction through a pull cord. During the process of engagement and disengagement, the expansion and contraction of the pull cord is controlled by the ball receiving external force to control the drive assembly. However, at the moment when the developing box and the machine drive head are out of engagement, the drive assembly and the machine drive head are in a mutually engaged state, and the two cannot rotate relative to each other. The ball cannot control the pull cord to drive the drive assembly to retract. Therefore, the drive assembly and the machine drive head cannot be disengaged, and interference occurs between the two.

Contents of the invention

The present invention provides a developing box to solve the problem in the prior art that the driving assembly and the machine driving head are in a state of interlocking with each other, the two cannot rotate relative to each other, the ball cannot control the pull rope to drive the driving assembly to retract, and the driving assembly and the machine drive The head cannot be disengaged and there is a technical problem of interference between the two.

The technical solution of the present invention is to provide a developing box.

A developing cartridge installed in an image forming device. The image forming device is provided with a machine driving head and a photosensitive drum. The machine driving head has a driving protrusion. The developing box is rotatably installed with respect to the photosensitive drum. In the image forming apparatus, the developing box includes:

box body;

developing roller;

a developing roller gear mounted to the developing roller;

A driving component provided at one end of the box body;

The driving components include:

A power receiving component engaged with the machine driving head, the power receiving component is provided with a power receiving protrusion, the power receiving protrusion can engage with the driving protrusion to receive the driving force of the driving protrusion;

a gear component, at least part of the power receiving portion is retractably disposed in the inner cavity of the gear component, and the developing roller gear meshes with the gear component;

A control component that receives an external force from the image forming device and controls the power receiving component to expand and contract along the axial direction of the developing roller. When the control component controls the power receiving component to extend, the power receiving component The protrusion is engaged with the driving protrusion. When the control component controls the power receiving component to retract, the power receiving protrusion can be disengaged from the driving protrusion.

The power receiving component is provided with a power transmission part, and the gear component is provided with a meshing part. When the control component controls the power receiving component to extend, the power transmission part engages with the meshing part to receive the driving force. When the control component controls the power receiving component to retract, the power transmission part is disengaged from the meshing part to interrupt receiving driving force.

The power transmission part is provided as a power transmission protrusion, the power transmission protrusion has a small diameter part, the engaging part is provided as an engagement hole, and when the power transmission part extends, the power transmission protrusion engages with the engagement hole , when the power transmission part retracts, the small diameter part of the power transmission protrusion engages with the engagement hole.

The power receiving component includes a power receiving head and a power transmission part. The power receiving head is provided with a coupling groove, the power transmission part is provided with a coupling protrusion, and the coupling groove is coupled with the coupling protrusion.

A torsion spring is provided between the power receiving head and the power transmission part. One end of the torsion spring is connected to the power receiving head, and the other end of the torsion spring is connected to the power transmission part.

The control component includes a slide block and a trigger lever. The slide block includes an inclined surface. The trigger lever contacts the inclined surface and pushes the slide block in a direction perpendicular to the axial direction of the developing roller.

In the power receiving head, the power transmission part and the slider are connected through a long pin. One end of the long pin is provided with a large diameter part, and the other end is provided with a retaining spring.

The power transmission part is covered with a first elastic element, one end of the first elastic element is in contact with the gear component, and the other end is in contact with the slider.

The slider is also provided with a positioning groove, and the trigger rod is installed in the positioning groove.

The trigger rod is provided with a first guide surface, and the first guide surface contacts the image forming device to guide the trigger rod to push the slider.

The trigger lever is further provided with a second guide surface. The second guide surface remains in contact with the image forming device when the developing cartridge is operating.

Since the small diameter part acts as a clutch, when the power receiving part retracts slightly, the small diameter part immediately meshes with the gear part. The meshing of the two cannot transmit power, so the power transmission part can idle with the gear part, and the power receiving head can It can rotate relative to the driving head of the machine, release the engagement state, and the two can be separated. Therefore, the developing cartridge will not interfere with the image forming device and can be taken out of the image forming device smoothly.

Description of the drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of the developing box of the present invention;

Figure 2 is a schematic structural diagram of the side end of the developing box of the present invention;

Figure 3 is a schematic structural diagram of the processing and driving assembly of the present invention;

Figure 4 is an exploded view of the developing box driving assembly of the present invention;

Figure 5 is a cross-sectional view of the developing box driving assembly of the present invention;

Figure 6 is a schematic structural diagram of the control part of the developing box of the present invention;

Figure 7 is a schematic structural diagram of the power transmission part and gear part of the developing box of the present invention;

Figure 8 is a schematic diagram of the engagement between the developing box and the machine drive head of the present invention;

Figure 9 is a schematic diagram of the developing box and the machine drive head disengaging according to the present invention;

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

As shown in Figure 1, the developing box 1 provided by the present invention includes: a box body 10, a developing roller 20 supported on the front end of the box body, a gear train and a driving assembly 30 located on one side of the box body 10, and a prevention gear train and driving assembly. The protective cover 40 30 is detached from the cartridge body 10 . The driving assembly 30 is configured to receive driving force from the imaging device to drive the gear train. The protective cover 40 limits the movement of the gear train and the driving assembly 30 in the axis direction of the developing roller 20 .

As shown in Figure 2, the side end of the developing box 1 is also fixed with a positioning bracket 50. The positioning bracket 50 is used to position the installation position of the gear train and the drive assembly 30. The gear train includes a developing roller gear 21 and a powder feeding roller gear 51. The developing roller gear 21 is arranged on the developing roller 20. The developing roller gear 21 receives the driving force from the driving assembly 30 to drive the developing roller 20 to rotate. The powder feeding roller gear 51 is arranged on the powder feeding roller (not shown). The roller gear 50 receives the driving force from the driving assembly 30 to drive the powder feeding roller to rotate. The gear train and the driving assembly 30 are arranged between the positioning bracket 50 and the protective cover 40, so its axial displacement is limited by the two. There are openings on the protective cover 40. There is a through hole 41 through which a portion of the driving assembly 30 is exposed outside the box body 10 .

The detailed structure of the driving assembly provided by the present invention will be described below with reference to Figures 3-7.

As shown in Figure 3, the driving assembly 30 includes: a power receiving portion 30a, a gear component 34 and a control component 30b. The power receiving component 30a is disposed in the inner cavity of the gear component 34, and can be telescopic and extended relative to the axis direction of the developing roller. When receiving the driving force of the image forming apparatus, the gear member 34 is driven to rotate, and the control member 30b controls the expansion and contraction of the power receiving member 30a by touching a part of the image forming apparatus.

As shown in Figures 4-7, the power receiving component 30a includes a power receiving head 31 and a power transmission part 33. The power receiving head 31 is provided with a power receiving protrusion 31a and a coupling groove 31b. The power receiving protrusion 31a is connected to the drive of the machine driving head 100. The protrusion 100a engages to receive the driving force of the image forming device. The power transmission part 33 is provided with a coupling protrusion 33a and a power transmission protrusion 33c. The coupling protrusion 33a engages with the coupling groove 31b, so that the driving force received by the power receiving head 31 can be transmitted to the power transmission part. 33, the power transmission protrusion 33c is provided as a power transmission shaft that transmits driving force to the gear member 34, and a small diameter portion 33b is provided thereon. The diameter of the small diameter portion 33b is smaller than the diameter of the power transmission protrusion 33c. When the small diameter portion 33b and When the gear component 34 is meshed, the power transmission protrusion 33c cannot transmit power to the gear component 34. With this structural arrangement, the power transmission part 33 and the gear component 34 do not remain in mesh at all times. Only the power transmission part 33 is pushed along the slider 36. After the developing roller extends a certain distance in the axial direction (this distance is approximately equal to the distance at which the power receiving head 31 extends to mesh with the machine driving head 100 ), the power transmission part 33 meshes with the gear member 34 . Considering that the developing cartridge is in contact with the machine driving head 100 At the moment when 100 is disengaged, the machine driving protrusion 100a and the power receiving protrusion 31a are in a mutually engaged state. Since the machine driving head 100 stops rotating, even if the developing cartridge rotates relative to the image forming device, the pressing of the trigger lever 37 is released, and the power receiving member 30a First retract slightly. Since the power receiving protrusion 31a is engaged with the machine driving protrusion 100a, the two cannot be disengaged. Therefore, the power receiving component 30a cannot be further retracted. The advantage of the power transmission part 33 being provided with the small diameter portion 33b is that: the small diameter portion 33b acts as a clutch. When the power receiving component 30a retracts slightly, the small diameter part 33b immediately meshes with the gear component 34. The meshing of the two cannot transmit power, so the power transmission part 33 can idle with the gear component 34. At this time , the power receiving head 31 can rotate relative to the machine driving head 100, the engagement state is released, the two can be separated, and under the force of the first elastic element 35a and the second elastic element 35b, the power receiving part 30a passes through the slider 36 is pulled back to the retracted position. Therefore, the developing cartridge will not interfere with the image forming device and can be smoothly taken out of the image forming device.

A torsion spring 32 is also provided between the power receiving head 31 and the power transmission part 33. One end of the torsion spring 32 is connected to the power receiving head 31, and the other end is connected to the power transmission part 33. With this structure, the power receiving head 31 can transmit power to the power receiving head 31. The portion 33 rotates, and during the installation process, when the power receiving protrusion 31a and the machine driving protrusion 100a are pressed against each other and unable to mesh, the power receiving protrusion 31a can rotate and stagger away from the machine driving protrusion 100a, thereby preventing the occurrence of jamming.

In this embodiment, the power receiving head 31 and the power transmission part 33 are provided as two parts, and a torsion spring is provided between the two, which can prevent the phenomenon of jacking. Persons skilled in the art should understand that due to the phenomenon of jacking during the installation process, For small probability events, the two can also be set as a whole.

As shown in Figure 7, the gear component 34 is provided with a hollow cavity inside for accommodating the power transmission part 33. A meshing hole 34a is provided at the bottom end of the cavity. The meshing hole 34a meshes with the power transmission protrusion 33c. The specific meshing method is spline. The gear member 34 is provided with a first tooth portion 34 b and a second tooth portion 34 c on the outside. The first tooth portion 34 b is arranged to mesh with the developing roller gear 21 , and the second tooth portion 34 c is arranged to mesh with the powder feeding roller gear 51 .

As shown in Figure 6, the control component 30b includes a slider 36 and a trigger rod 37. The slider 36 is provided with a positioning groove 36a, a pressing slope 36b, an elastic element mounting hole 36c and a support platform 36d. The trigger rod 37 is provided with a pressing portion. 37a, the first guide surface 37b, the second guide surface 37c, the positioning groove 36a is used to accommodate the pressing part 37a, the pressing part 37a pushes the pressing slope 36b to push the sliding block 36 to slide, the pressing part 37a pushes the pressing slope 36b in the same direction as the sliding block 36 The sliding direction is vertical, the elastic element mounting hole 36c is used to install the second elastic element 35b, and the support platform 36d is used to support the power transmission part 33. When the slider 36 is pressed, the power transmission part 33 is driven to move, so that the power transmission part 33 is connected to the The gear members 34 mesh. The elastic element mounting hole 36c is used to install the second elastic element 35b. The second elastic element 35b exerts a spring force so that the slider 36 is in the retracted position when the trigger lever 37 is not triggered. The first guide surface 37b is set as an inclined surface. When working, the trigger rod 37 rotates relative to the photosensitive drum. When the trigger rod 37 rotates with the developing cartridge, it will touch a part of the image forming device. With further rotation, under the action of the first guide surface 37b, a part of the image forming device is forced to push. The trigger rod 37 is forced to push. Since the trigger rod 37 cooperates with the slider 36, the trigger rod 37 is forced to push, so the slider 36 slides. The slider 36 pushes the power transmission part 33 to extend, and the power transmission part 33 extends. The power receiving head 31 will be driven to extend, and the power receiving head 31 will be extended to engage with the machine driving head 100. During the extending process of the power transmission part 33, its power transmission protrusion 33c will engage with the gear component 34, thereby driving the entire gear system to rotate. , the second guide surface 37c is provided as an arc surface, and when the trigger lever 37 is forced to push, the second guide surface 37c remains in contact with a part of the image forming device. The structure of the trigger rod 37 and the slider 36 is used to control the expansion and contraction of the power receiving part 30a. Compared with the existing technology of pulling the rope to control the expansion and contraction, this structure is more reliable. In addition, the structure triggers accurately. The trigger rod can be pushed by receiving the external force from the image forming device. Slider movement.

As shown in Figure 5, Figure 5 is a cross-sectional view of the drive assembly after assembly. The gear component 34 is installed on the positioning bracket 50. The power receiving component 30a, the gear component 34 and the control component 30b are connected through a long pin 39. One end of the long pin 39 has The large diameter part 39a is connected to the power receiving head 31, and the other end is connected to the slider 36 through the circlip 38. The outer surface of the power transmission part 33 is covered with a first elastic element 35a, and one end of the first elastic element 35a abuts the end surface of the gear part. The other end is in contact with the slider support platform 36d, and the second elastic element 35b is arranged between the slider and the positioning bracket 50. One end of it is in contact with the positioning bracket 50, and the other end is installed in the elastic element installation hole. The second elastic element 35b and When the trigger lever 37 is not pressed, the first elastic element 35a applies spring force to keep the slider 36 in the retracted state. When the slider 36 is pressed by the trigger rod 37, the power receiving component 30a is pushed out along the axial direction of the developing roller through the circlip 38 and the support platform 36d. When the slider 36 is not stressed, the first elastic element 35a and Under the elastic force of the second elastic element 35b, the large diameter portion 39a at one end of the long pin 39 pulls the power receiving member 30a to retract along the axial direction of the developing roller.

The following describes the installation process of the developing cartridge of the present invention with reference to FIG. 8. After the developing cartridge of the present invention is installed at the installation position of the image forming device, the power receiving component 30a is in a retracted state and does not engage with the machine drive head 100. When the developing cartridge needs to perform developing work When the developing cartridge rotates in the image forming device, when it rotates close to the developing position, the trigger lever 37 is slowly pressed by a part of the image forming device. When the trigger lever 37 is pressed, the slider 36 will be slowly pushed along the axis of the developing roller. direction to extend, the slider 36 therefore drives the power transmission part 33 and the power receiving head 31 to extend. When the power receiving head 31 extends to a position that is substantially engaged with the machine driving head 100, the power transmission protrusion 33c of the power transmission part 33 and The gear component 34 meshes. At this time, the power receiving head 31 receives the driving force of the machine driving head 100 and transmits it to the power transmission part 33. The power transmission part 33 transmits the driving force to the gear component 34, thus driving the entire gear system to work, and the developing cartridge starts to perform development. Work.

When the development work of the developing cartridge is completed, see Figure 9, the developing cartridge further rotates away from the working position. At the moment of further rotation, under the force of the first elastic element 35a and the second elastic element 35b, the power receiving component 30a returns slightly. At this time, the power transmission part 33 is disengaged from the gear member 34 under the action of the small diameter part 33c, so the machine drive head 100 and the power joint head 31 can rotate relative to each other to disengage the engagement state, and then as the developing cartridge further rotates, The power receiving member 30a retracts until the rotation enters the next developing operation, and the power receiving member 30a extends according to the above steps.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions recorded in the foregoing embodiments, or to equivalently replace some of the technical features, and these modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the spirit of the technical solutions of the various embodiments of the present invention. and scope.

Claims (10)

1. A developing cartridge installed in an image forming apparatus provided with a machine driving head (100) and a photosensitive drum, the machine driving head having a driving protrusion (100a), the developing cartridge being relatively The photosensitive drum is rotatably installed in the image forming device, wherein the developing box includes: box(10); Developing roller (20); Developing roller gear (21), installed to the developing roller (20); A driving component (30) provided at one end of the box (10); The driving assembly (30) includes: A power receiving component (30a) that meshes with the machine driving head (100). The power receiving component (30a) is provided with a power receiving protrusion (31a). The power receiving protrusion (31a) can interact with the driving protrusion. (100a) bites to receive the driving force of the driving protrusion (100a); Gear component (34), at least part of the power receiving component (30a) is retractably disposed in the inner cavity of the gear component (34), and the developing roller gear (21) meshes with the gear component (34) ; Control component (30b). The control component (30b) receives the external force of the image forming device and controls the expansion and contraction of the power receiving component (30a) along the axial direction of the developing roller (20). When the control component (30b) ) controls the power receiving component (30a) to extend, the power receiving protrusion (31a) and the driving protrusion (100a) engage, and the control component (30b) controls the power receiving component (30a) to return When the time is shortened, the power receiving protrusion (31a) can be disengaged from the driving protrusion (100a); The power receiving component (30a) is provided with a power transmission part (33), the gear component (34) is provided with a meshing part (34a), and the control component (30b) controls the extension of the power receiving component (30a). When, the power transmission part (33) engages with the meshing part (34a) to receive driving force, and when the control component (30b) controls the power receiving component (30a) to retract, the power transmission part (33) ) disengages from the engaging portion (34a) to interrupt receiving driving force. 2. The developing cartridge according to claim 1, wherein the power transmission portion (33) is provided with a power transmission protrusion having a small diameter portion (33b), and the engaging portion (34a) It is provided as an engagement hole. When the power transmission part (33) extends, the power transmission protrusion engages with the engagement hole. When the power transmission part (33) retracts, the small diameter portion of the power transmission protrusion (33b) engages with the engagement hole. 3. The developing cartridge according to any one of claims 1 to 2, characterized in that the power receiving component (30a) includes a power receiving head (31) and a power transmission part (33), and the power receiving head (31) ) is provided with a coupling groove (31b), the power transmission part (33) is provided with a coupling protrusion (33a), and the coupling groove (31b) is coupled with the coupling protrusion (33a). 4. The developing cartridge according to claim 3, characterized in that a torsion spring (32) is provided between the power receiving head (31) and the power transmission part (33), and the torsion spring (32) One end of the torsion spring (32) is connected to the power receiving head (31), and the other end of the torsion spring (32) is connected to the power transmission part (33). 5. The developing cartridge according to claim 4, characterized in that the control component includes a slider (36) and a trigger lever (37), the slider (36) includes a slope (36b), and the trigger The rod (37) contacts the inclined surface (36b) and pushes the slider (36) in a direction perpendicular to the axial direction of the developing roller. 6. The developing cartridge according to claim 5, characterized in that the power receiving head (31), the power transmission part (33) and the slider (36) are connected through a long pin (39), The long pin (39) is provided with a large diameter portion (39a) at one end and a retaining spring (38) at the other end. 7. The developing cartridge according to claim 5, characterized in that the power transmission part (33) is covered with a first elastic element (35a), and one end of the first elastic element (35a) is in contact with the The other end of the gear component (34) abuts the slider (36). 8. The developing cartridge according to claim 5, characterized in that the slider (36) is also provided with a positioning groove (36a), and the trigger rod (37) is installed into the positioning groove (36a). 9. The developing cartridge according to claim 8, characterized in that the trigger lever (37) is provided with a first guide surface (37b), and the first guide surface (37b) contacts the image forming device guide. The trigger rod (37) pushes the slider (36). 10. The developing cartridge according to claim 9, characterized in that the trigger lever (37) is also provided with a second guide surface (37c), and the second guide surface (37c) is used when the developing cartridge is working. while maintaining contact with the image forming device.